Coulomb interactions generate a plethora of novel emergent phenomena in condensed-matter systems, particularly when electronic confinement to fewer than three spatial dimensions increases the relative strength of potential to kinetic energy [1]}. One experimental tool for studying interaction-driven effects in low-dimensional systems is Coulomb drag [2]}, [3]}, [4]}, [5]}. When a current is driven in a conductor that is near but electrically isolated from another, Coulomb interactions between the charge carriers in the two conductors generate a voltage drop in the “passive” conductor. The drag resistance is thus a direct probe of interlayer charge carrier interaction. Most of the past theoretical and experimental efforts have focused on drag between 2-dimensional (2D) conductors, such as electrons confined in semiconductor heterointerfaces [3]}, [4]} and graphene [5]}, [9]}, [10]}, revealing several new emergent phenomena including exciton condensation under strong magnetic fields [5]}. Drag experiments have also been performed between 1-dimensional (1D) conductors [12]}, [13]}, [14]}, showing signatures of Wigner crystal and Luttinger liquid behavior.
